I’ve had the TOTEM ARROs in a prior system, so I know their strengths and warts very well. . I also know the KEFQ150’s well .They are very different in both build quality and performance (and price).
@audiojedi nailed it ,,,,The ARROs are a defo step up from the Q150’s, BUT you will need a significant upgrade to your current integrated amp to permit them to perform.,
All TOTEMs are power hogs craving “grunt” (… that’s more current (amps) , not WPC which are meaningless by themselves with a current rating …)
Think SIMAUDIO as a first preference option.
If the amp upgrade as a requisite matched upgrade to upgrading to the ARROs is not budget manageable, then think about the amp upgrade first, and just keep your budget KEF bookshelf speakers . They can and will perform better..
The philosophy is clear. An affordable speaker with decent upgraded amplification (and source) makes more sense than an expensive speaker with a cheap amp (and source.) .